*** A dispute between a couple on the Grand Concourse ended with a man being arrested, police said yesterday.

Selena Livingston, 25, was talking on her cellphone at 4 p.m. Saturday when the boyfriend, Gerard Torres, 29, of the Bronx, demanded to know who she was talking to.

And argument broke out and Torres allegedly chases Livingston into the subway station at 175th street where he punched her, cops said. He then fled to his home on Walton Avenue, where he was arrested.

MANHATTAN

*** A 21-year-old woman and her 18-year-old boyfriend were fatally shot outside an apartment building at 123 W. 133rd St. in Harlem around 1 a.m. yesterday, police said.

Yvette Duncan, who lived in the building, was shot in the chest. Doniel Ambeister of Brooklyn, was shot three times in the back. They died at Harlem Hospital.

Police believe the shooting stemmed from a long-running feud between Ambeister and another man.

Ambeister’s sister, who asked that her name not be printed, said her brother tried to run, but he fell, and the killer cold-bloodedly shot him as he lay on the ground. Duncan was shot as she ran into her apartment building.

The killer escaped.

*** A woman stole the identities of eight patients at the Financial District physical therapy office where she worked, police said yesterday.

Margaret Williams, of The Bronx, stole credit card numbers and other personal identifiers from patients’ records. She left a paper trail of purchases totaling $3000, cops said.

Williams was charged with identity theft and grand larceny.

BROOKLYN

*** A 28-year-old man talking on his cellphone in East Flatbush was hit in the head by a stray bullet about 4 a.m. yesterday, police said.

The wounded man was grazed by a bullet as he stood at Church Avenue and East 42nd Street. He was taken to Kings County Hospital where he was treated and released.

*** A gang of thugs attacked a couple walking on Church Avenue at E. 45th Street around 1 a.m. yesterday. They shot the 20-year-old woman in the foot and her 19-year-old companion in the leg.

Another man, who may have been an innocent passerby, also was shot in the leg.

They were taken to Kings County Hospital, where they were treated and released.

*** A 27-year-old man and a 20-year-old woman were wounded by gunfire yesterday morning in Flatbush.

The woman was treated at Kings County Hospital for a wound to the leg. The man was shot in the shoulder. The violence took place at Linden Boulevard and Flatbush Avenue.

*** Police said a dispute between a couple at E. 34th Street and Church Avenue in East Flatbush erupted into gunfire when a man, who may have tried to intervene, shot them and two other people.

Police arrested Jamal Rogers, 26, around 3:30 a.m. yesterday and charged him with attempted murder, assault and criminal possession of a weapon.